(Here are the events just in case your Kages don't post them. Also for the missions or catastrophes (can't believe I spelled that) anyone can start those.
Magma Valley- A valcano errupts and causes villagers to evacuate the village.
Stealth Valley- Gang of rogues take over the eastern gate and three ninja are sent to deal with the problem.
Death Valley- The fog begans to clear up and two myserious ninja appear. Sends two or three ninja to investiagate.
Snow Valley- Sun begans to shine melting all the snow, terrible flood threatens to drown the village.